Physics
Physics
Problem
A block of mass rests on a horizontal rough surface for which the coefficient of kinetic friction is . A force of is applied to the block at an angle of above the horizontal. a. (i) Resolve the applied force into horizontal and vertical components. b. (ii) Calculate the normal reaction exerted by the surface on the block. c. (iii) Determine the magnitude of the kinetic frictional force acting on the block. d. (iv) Find the acceleration of the block along the surface.Intuitive explanation
The key is recognizing that an angled force has two effects: it pushes the block forward and reduces the normal force by lifting slightly. You'll need to resolve the applied force into horizontal and vertical components, use the vertical component to find the new normal force, then calculate kinetic friction from that reduced normal force. Once you have friction, you can find the net horizontal force and acceleration.
Intuitive explanation
The key is recognizing that an angled force has two effects: it pushes the block forward and reduces the normal force by lifting slightly. You'll need to resolve the applied force into horizontal and vertical components, use the vertical component to find the new normal force, then calculate kinetic friction from that reduced normal force. Once you have friction, you can find the net horizontal force and acceleration.